A LOT of GM engines have them screwed right into the bottom of the intake valley RIGHT in the middle of valve train noise. That's not the frequency knock sensors are designed to pick up anyway. But by all means, go to all the trouble in the world to put it where you want to. lol
They also have years and years and years and thousands and thousands and thousands of dollars of research and development to know which frequency they’re looking for. And which frequencies to ignore.
And also those knock sensors in the lifter valley of the LS engines, rusted like crazy and caused all kinds of problems.